13,945 research outputs found
Isospin mode splitting and mixing in asymmetric nuclear matter
We estimate exclusive density and asymmetry parameter dependent dispersion
relations of various charged states of pions in asymmetric nuclear matter. The
possibility of matter induced mixing of with is clearly exposed
with the further mass modification of meson due to mixing. Asymmetry
driven mass splitting and mixing amplitude are of the same order as the
corresponding values in vacuum. Closed form analytic results for the mass
shifts and dispersion relations with and without mixing are presented.
Furthermore, we discuss the sensitivity of our results on the scalar mean field
within the framework of Quantum Hadrodynamics.Comment: 8 pages, 4 Figure
Improved Dark Energy Detection through the Polarization-assisted WMAP-NVSS ISW Correlation
Integrated Sachs-Wolfe (ISW) effect can be estimated by cross-correlating
Cosmic Microwave Background (CMB) sky with tracers of the local matter
distribution. At late cosmic time, the dark energy induced decay of gravitation
potential generates a cross-correlation signal on large angular scales. The
dominant noise are the intrinsic CMB anisotropies from the inflationary epoch.
In this Letter we use CMB polarization to reduce this intrinsic noise. We
cross-correlate the microwave sky observed by Wilkinson Microwave Anisotropy
Probe (WMAP) with the radio source catalog compiled by NRAO VLA Sky Survey
(NVSS) to study the efficiency of the noise suppression . We find that the
error bars are reduced about 5-12 %, improving the statistical power.Comment: 10 pages, 2 figure
Prosthetic glenoid fixation: lateralisation of the centre of rotation of a fixed-fulcrum total shoulder replacement is not associated with suboptimal glenoid bone formation during a functionally-relevant loading protocol
Prosthetic glenoid fixation: lateralisation of the centre of rotation of a fixed-fulcrum total shoulder replacement is not associated with suboptimal glenoid bone formation during a functionally-relevant loading protocol
An information adaptive system study report and development plan
The purpose of the information adaptive system (IAS) study was to determine how some selected Earth resource applications may be processed onboard a spacecraft and to provide a detailed preliminary IAS design for these applications. Detailed investigations of a number of applications were conducted with regard to IAS and three were selected for further analysis. Areas of future research and development include algorithmic specifications, system design specifications, and IAS recommended time lines
Influence of Promoter Type on Bimetallic Co-Ni/Al 2O3 Catalyst for Steam Reforming of Glycerol
Biodiesel is produced from a variety of renewable sources including waste cooking oil. However, its production has led to a glut of glycerol (a by-product, in the amount of 1 mol of glycerol for every three of fatty acid methyl esters). Glycerol presently has low-level and limited use in pharmaceuticals production. The present work deals with steam reforming of glycerol over a bimetallic Co-Ni/Al2O3 catalyst system promoted by 2.5wt% alkaline earth oxides (AEO) and lanthanide oxides (LO). The addition of metal oxide from these two groups reportedly minimizes carbon deposition with possible improvement in product selectivity and syngas production rate. Our objective was to provide a systematic correlation between physicochemical properties of the promoted catalyst and reaction metrics
A new broken U(1)-symmetry in extreme type-II superconductors
A phase transition within the molten phase of the Abrikosov vortex system
without disorder in extreme type-II superconductors is found via large-scale
Monte-Carlo simulations. It involves breaking a U(1)-symmetry, and has a
zero-field counterpart, unlike vortex lattice melting. Its hallmark is the loss
of number-conservation of connected vortex paths threading the entire system
{\it in any direction}, driving the vortex line tension to zero. This tension
plays the role of a generalized ``stiffness'' of the vortex liquid, and serves
as a probe of the loss of order at the transition, where a weak specific heat
anomaly is found.Comment: 5 pages, 3 figure
- …